Emergency governor for elastic-fluid turbines and the like



March 13, 1928.

E. D. DICKINSON EMERGENCY GOVERNOR FOR ELASTIC FLUID TURBINES AND THE LIKE .l. rrrr E.

Inventor. Edgar D. Dickinson, y

His Attorneg.

1 Valve l is biased toward normally by a catch controlled Iatentcd Mar. 13, 1928.

UNITED STA EDGAR D. DICKITNSO N, F BEVERLY, MASSACHUSETTS, ASSIGINOR T0 GENERAL ELEG- EMERGENCY GOVERNOR FOB EL The present invention relates to TES PATENT OFFICE.

TRIO COMPANY, A CORPORATION OF NEW YORK.

Application filed June 28,

emergency governors for elastic fluid turbines or sinnlar machines which governors are utilized to effect a shutting off of the supply of actuating fluid to the machine in case of excessive speed.

to emergency belt or plunger type which comprise a bolt or plunger eccentrically mounted in an open- The invention relates especially governors of the so-termed ing which extends transversely of the shaft and is normally held against movement by a governor spring,

the plunger or bolt flying outward by centrifugal force in case of excessive speed in turn contr anism.

The object an improved whereby ane of this type to engage a trip finger which ols the emergency valve mechof the invention is to provide construction and arrangement mergenoy governor mechanism maybe tested without overspeeding the machine or without disturbing the setting of the emergency governor, and for a consideration of what I believe to be novel and my to the accon invention, attention is directed ipanymg description and the claims appended thereto.

In the drawing,

with certain of an emergency plunger type Fig. 2 shows Fig. 1 is a sectional view parts shown diagrammatically governor of thebol't or embodying my invention, and

diagrammat cally its application to an elastic fluid turbine.

Heferrin g elastic fluid to the drawing, 1 indicates an turbine of any suitable type and provided with a fluid chest- 2 to which elastic fluid is admitted by a conduit 3. In

conduit 3 is valve 4, a we is held open by a link 5 w a combined trip and throttle ll known type being indicated. closed position but hich is connected by a rod 6 to Connected to the free lever 7 is a plunger rod 8 which extends down through a housing 9 to a point in I r b Trip finger 1 presents a and the top Spring 13 ward but is sion by trip fingerplnnger rod the drawing.

acts to proximity to a trip finger 10. 0 is suitably pivoted at 1.1 and fiat surface upon which the lower On is a collar-'12 between which of easing 9 is a spring 13'. force plunger rod 8 down normally held under compres; upon which the rests as is shown in Fig. 2 of When trip finger 10 is moved ASTIUFLUID TURBINES AND LIKE.

1926. Serial No. 118,901.

- described is a well known arrangement and one in common use. It is shown more or less diagrammatically and isto be taken as typical of any suitable arrangement for effecting closing of an emergency valve.

Carried by and forming a part of the turbine shaft so that it rotates therewith, is a shaft extension 1 1 having a flange portion 15 for use in bolting it to the turbine shaft.

In shaft extension 14 is a transversely-extending opening 16 in which is arranged a sleeve 17. Sleeve 17 is fastened in place by a flanged head 18 held by bolts 19. In one end of sleeve 17 is a liner 20 which provides a guide surface 21. In sleeve 17 is a bolt or plunger 22 having a head 23 adapted to engage trip finger 10. At its end opposite head 23 is arranged a shoulder 24 between which and a plate 25 resting on one end of liner 20 is located an emergency governor spring 26. Carried by plunger 22 is a flange 27 which slides on guide surface 21,. The other end of plunger 22 slides in a guide 27 which forms also a stop for limiting the inward movement of the plunger. In flange 27 is an opening 28 and between plunger 22 and plate 25 is an annular opening 29. In shaft extension 14 is an annular chamber 30 which communicates with the interior of sleeve 17 through one or more openings 31. Atthe outer end of shaft extension 1a is a wall 32 which forms an annular chamber 33 connected to annular chamber 30 by a passage 34. In wall 32 is an opening through which projects a sleeve 35, such sleeve being flared outwardly at its outer end to form a sort of trough which communicates with annular chamber 33 through an annular space between thesleeve and the adjacent edge of the opening in wall 32. The emergency governor construction just described all rotates with the turbine shaft. Liner 20, flange 27 and plate 25 form an annular pocket which surrounds the head of bolt or plunger 22.

Adjacent to 36 carried by a fixed wall 'sprin QG'and bolt or mechanism.

;throughpipe '86. Pipe 36 and valve 39 represent any suitable means for supplying liq uid to the'trough formed by'sleevc 35.

Bolt or plunger 22 is mounted eccentrically in the'opening through shaft extension let, the center of mass of the bolt or plunger being above the center of rotat1on'in the position of the parts shown in Fig. 1. Thus when the turbine shaft is' rotating ithas a tendency to fly outward dre centrifugal force. Spring :26 is set so that at normal speeds the bolt or plunger is held stationary. However, in'case oi a certain overspeed, for example 10 per cent overspeed,then centrifugal force will overcome plunger 22 will tiy outward. \Vhen this occurs, its head 23 strikes trip finger 10 knocking it from under rod Siand effecting closing of valve int-clan 11131114, as'rei'erred to above. This is the usual operation of an emergency governor ofthe bolt or plunger type. I

When it is desired to test the emergency governor to see if it is in proper working condition valve 39 is open. This permits liquid to-fiow out through pipe 36 such liquid being discharged into the annular trough i'ormed by sleeve 35. From here the liquid flows through passages 3-.t and 31 to the interior of sleeve 17, a part of such liquid finding-"its way through annular passage 29 to the pocket formed byliner 20, flange 2? and plate 2*. This serves then to increase the weight of plunger 22 because of the liquid trapped in such pocket and due to this increased weight the plunger will more outwardly at a normal turbine speed, thereby effecting tripping of the emergency governor i After the valve mechanism has tripped, valve 39 is closed. The liquid in the pocket then escapesthrough opening This then reduces the weight of the plunger to its normal value whereupon spring 26 will restore it to its normal position. The emergeney valve 4 may be then reset in the usual manner.

With the above described arrangement, it will be seenathat I provide a means whereby an emergency governor of the boltor plunger type may be tested without overspeeding the turbine or without disturbingthe adjustment of the emergency governorspring 26. As pointed out above, the li uid supplied to the pocket surrounding the read of the boltor plunger serves to addweight to the heavy end of the bolt or plunger. The liquid therefore need not be sup )licd under pressure, it; being sullicient that the arrangement be such thatthe liquid flows into the trough formed by sleeve 35. Also, it will be seen that as soon as the valve 39 is elosed, the liquid in the pocket leaks out through opening 28 so that the device automatically resets itself.

in accordance with the provisions of the patent statutes, I have described the principle of operation of my invention, together witlr the apparatus which I now consider to represent the best-embodiment thereof, but I desire to haveit understoodthatthe apparatus shown is'only illustrative and that-the invmitionniay be carried out by othen-lneans.

What I claim as new and desire to-secure by Letters Patent of the United Statesfls:

l.- The combination with an emerency governor comprising a shaft inembcr ha-ving a transverse opening, -ancceentvidally mounted plunger in the opening, and a governor spring for holding the plungeragainst movement, of means providing a, ocket surrounding the plunger, and means orsupplying liquid to said pocket.

In an emergency governor mechanism,

the combination of a shaft, means providing an opening extending transversely of the shaft, a plunger in the opening, saidplunger having its center of mass to one side. of the center of rotation of the shaft, agover-nor spring which normally holds said plunger stationary, a flange carried by the plunger which defines with the adjacentwvallof the opening a pocket surrounding-the plun er,

and means whereby a liquid may be supp ied to said, pocket.

3. In an emergency mechanism, the combination of a shaft, means providing an 0 mm: ing extending transversely of the sha t,- a plungerin the opening,said plunger-having its center of mass to one side of the center-l of rotation of the shaft, a governor spring which normally holds said plunger stationary, a flange carried by the plungelmwhich defineswith the adjacent wall of the opening a pocket surrounding the plunger, means whereby a liquid maybe supplied to said pocket, and means for permitting the escape of liquid from said pocket.

In witness whereof, I have hereunto set mv hand this 24th day of June, 1926. I

EDGAR D. DICKINSON.

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